(email: h-negishi@aist.go.jp)

 

Laboratory: Institute of Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (Japan)

Address: 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565 Japan

 


Abstract

I am imvestigating the preparation of silicalite membranes by hydrothermal synthesis with electrophoretic deposition as a seeding technique. Silicalite is a kind of zeolite. About 2 mm of silicalite powder were deposit on the porous stainless steel tube. After hydrothermal synthesis, the obtained silicalite membrane show high separation performance of alcohol from alcohol/water. These membranes are applied to refinement of bio-alcohol, such as bio-ethanol and bio-butanol.

I am also studying the fabrication of mesoporous silica (MPS) thick film on stainless steel substrate and/or aluminum substrate by using ordered MPS powder, because energy efficient adsorption systems using low temperature exhaust heat have attracted attention due to the increasing interest in global environmental problems. Approximately 10 mm diameter of MPS powder was deposited in acetone, and a uniform coating approximately 250 μm in thickness was obtained. The obtained MPS thick film showed the quick water vapor adsorption/desorption properties.

In addition, I am studying the fundamental dc-EPD mechanism of oxide powder in organic suspension.

 

Selected publications

  • H. Negishi, K. Sakaki and T. Ikegami, Silicalite Pervaporation Membrane Exhibiting a Separation Factor of over 400 for Butanol, Chem. Lett. 2010, 39, 1312-1314 (2010)
  • H. Negishi, A. Endo, T. Ohmori and K. Sakaki, Fabrication of Mesoporous Silica Coating by Electrophoretic Deposition, Ind. Eng. Chem. Res., 47, 7236–7241 (2008)
  • H. Negishi, K. Yamaji, T. Imura, D. Kitamoto, T. Ikegami and H. Yanagishita, Electrophoretic deposition mechanism of YSZ/n-propanol suspension, J. Electrochem. Soc., 152(2), J16-J22 (2005)